Python多处理：增加池大小后出现断开管道异常

Python Multiprocessing: Broken Pipe exception after increasing Pool size(Python多处理：增加池大小后出现断开管道异常)

问题描述

我得到的异常。我所做的只是增加了泳池数量

代码

 def parse(url):
  r = request.get(url)
POOL_COUNT = 75
with Pool(POOL_COUNT) as p:
    result = p.map(parse, links)



File "/usr/lib64/python3.5/multiprocessing/pool.py", line 130, in worker
    put((job, i, (False, wrapped)))
  File "/usr/lib64/python3.5/multiprocessing/queues.py", line 355, in put
    self._writer.send_bytes(obj)
  File "/usr/lib64/python3.5/multiprocessing/connection.py", line 200, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/usr/lib64/python3.5/multiprocessing/connection.py", line 404, in _send_bytes
    self._send(header + buf)
  File "/usr/lib64/python3.5/multiprocessing/connection.py", line 368, in _send
    n = write(self._handle, buf)
BrokenPipeError: [Errno 32] Broken pipe
Process ForkPoolWorker-26:
Traceback (most recent call last):
  File "/usr/lib64/python3.5/multiprocessing/pool.py", line 125, in worker
    put((job, i, result))
  File "/usr/lib64/python3.5/multiprocessing/queues.py", line 355, in put
    self._writer.send_bytes(obj)
  File "/usr/lib64/python3.5/multiprocessing/connection.py", line 200, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/usr/lib64/python3.5/multiprocessing/connection.py", line 404, in _send_bytes
    self._send(header + buf)
  File "/usr/lib64/python3.5/multiprocessing/connection.py", line 368, in _send
    n = write(self._handle, buf)
BrokenPipeError: [Errno 32] Broken pipe

推荐答案

我也看到了管道损坏异常。但我的要复杂得多。

单独增加池大小会导致异常的一个原因是，您在请求模块中获取了太多内容，因此可能会导致内存不足。然后它会出现故障，特别是你有一个小掉期。

编辑1：我认为这是由内存使用引起的。太多的池连接占用了太多的内存，最终导致内存中断。它很难调试，我自己将池大小限制为4，因为我有一个小的RAM和大的包。

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